| Parameter |
Value |
| Designation |
C/2020 K6 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-09-15T13:36:00.020160Z |
| Orbit solution date (soln_date, UTC) |
2023-06-30T22:15:05Z |
| Obs used |
180 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
5.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-26T08:55:19.200000Z |
| Discovery magnitude (MPC) |
20.50 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-01-04.0000000 |
| e |
1.00320001 |
| q (au) |
5.868420 |
| a (au) |
-1833.877552 |
| i (deg) |
103.645272 |
| Ω (om, deg) |
291.528614 |
| ω (w, deg) |
44.307127 |
| M (ma, deg) |
0.001386 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.183 + 2.419\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.183 |
| n |
2.419 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
09:00:21.45 |
+57:44:16.6 |
HIP 43984 |
37.12 |
| 2026-06-01 12:00 |
09:00:26.40 |
+57:42:16.4 |
HIP 44492 |
35.53 |
| 2026-06-02 00:00 |
09:00:31.46 |
+57:40:16.4 |
HIP 44492 |
33.78 |
| 2026-06-02 12:00 |
09:00:36.62 |
+57:38:16.7 |
HIP 44492 |
32.07 |
| 2026-06-03 00:00 |
09:00:41.89 |
+57:36:17.2 |
HIP 44492 |
30.40 |
| 2026-06-03 12:00 |
09:00:47.25 |
+57:34:18.0 |
HIP 44492 |
28.77 |
| 2026-06-04 00:00 |
09:00:52.72 |
+57:32:19.1 |
HIP 44492 |
27.20 |
| 2026-06-04 12:00 |
09:00:58.29 |
+57:30:20.5 |
HIP 44492 |
25.70 |
| 2026-06-05 00:00 |
09:01:03.95 |
+57:28:22.1 |
HIP 44492 |
24.28 |
| 2026-06-05 12:00 |
09:01:09.72 |
+57:26:24.0 |
HIP 44492 |
22.94 |
| 2026-06-06 00:00 |
09:01:15.58 |
+57:24:26.2 |
HIP 44492 |
21.72 |
| 2026-06-06 12:00 |
09:01:21.54 |
+57:22:28.8 |
HIP 44492 |
20.64 |
| 2026-06-07 00:00 |
09:01:27.59 |
+57:20:31.6 |
HIP 44492 |
19.70 |
| 2026-06-07 12:00 |
09:01:33.74 |
+57:18:34.7 |
HIP 44492 |
18.95 |
| 2026-06-08 00:00 |
09:01:39.98 |
+57:16:38.1 |
HIP 44492 |
18.39 |
| 2026-06-08 12:00 |
09:01:46.32 |
+57:14:41.8 |
HIP 44492 |
18.05 |
| 2026-06-09 00:00 |
09:01:52.75 |
+57:12:45.8 |
HIP 44492 |
17.93 |
| 2026-06-09 12:00 |
09:01:59.27 |
+57:10:50.2 |
HIP 44492 |
18.06 |
| 2026-06-10 00:00 |
09:02:05.87 |
+57:08:54.8 |
HIP 44492 |
18.41 |
| 2026-06-10 12:00 |
09:02:12.57 |
+57:06:59.8 |
HIP 44492 |
18.98 |
| 2026-06-11 00:00 |
09:02:19.36 |
+57:05:05.1 |
HIP 44492 |
19.76 |
| 2026-06-11 12:00 |
09:02:26.23 |
+57:03:10.8 |
HIP 44492 |
20.70 |
| 2026-06-12 00:00 |
09:02:33.20 |
+57:01:16.8 |
HIP 44492 |
21.81 |
| 2026-06-12 12:00 |
09:02:40.24 |
+56:59:23.1 |
HIP 44492 |
23.04 |
| 2026-06-13 00:00 |
09:02:47.38 |
+56:57:29.7 |
HIP 44492 |
24.39 |
| 2026-06-13 12:00 |
09:02:54.59 |
+56:55:36.7 |
HIP 44492 |
25.83 |
| 2026-06-14 00:00 |
09:03:01.89 |
+56:53:44.1 |
HIP 44492 |
27.35 |
| 2026-06-14 12:00 |
09:03:09.27 |
+56:51:51.8 |
HIP 44492 |
28.94 |
| 2026-06-15 00:00 |
09:03:16.74 |
+56:49:59.9 |
HIP 44492 |
30.58 |
| 2026-06-15 12:00 |
09:03:24.28 |
+56:48:08.3 |
HIP 44223 |
31.10 |
| 2026-06-16 00:00 |
09:03:31.90 |
+56:46:17.1 |
HIP 44223 |
30.84 |
| 2026-06-16 12:00 |
09:03:39.60 |
+56:44:26.3 |
HIP 44223 |
30.74 |
| 2026-06-17 00:00 |
09:03:47.38 |
+56:42:35.8 |
HIP 44223 |
30.80 |
| 2026-06-17 12:00 |
09:03:55.24 |
+56:40:45.7 |
HIP 44223 |
31.02 |
| 2026-06-18 00:00 |
09:04:03.17 |
+56:38:56.0 |
HIP 44223 |
31.40 |
| 2026-06-18 12:00 |
09:04:11.17 |
+56:37:06.7 |
HIP 44223 |
31.93 |
| 2026-06-19 00:00 |
09:04:19.25 |
+56:35:17.7 |
HIP 44223 |
32.60 |
| 2026-06-19 12:00 |
09:04:27.40 |
+56:33:29.2 |
HIP 44223 |
33.41 |
| 2026-06-20 00:00 |
09:04:35.62 |
+56:31:41.0 |
HIP 44223 |
34.35 |
| 2026-06-20 12:00 |
09:04:43.91 |
+56:29:53.3 |
HIP 44778 |
33.48 |
| 2026-06-21 00:00 |
09:04:52.27 |
+56:28:05.9 |
HIP 44778 |
31.40 |
| 2026-06-21 12:00 |
09:05:00.70 |
+56:26:18.9 |
HIP 44778 |
29.33 |
| 2026-06-22 00:00 |
09:05:09.20 |
+56:24:32.4 |
HIP 44778 |
27.26 |